두경부암 방사선 치료 시 Set-Up 조정 Head Holder 장치의 개발

심재구,송기원,김진만,박명환,Shim, JaeGoo,Song, KiWon,Kim, JinMan,Park, MyoungHwan 대한방사선치료학회 2014 대한방사선치료학회지 Vol.26 No.1

두경부암 환자의 헤드 홀더를 사용하는 경우 모의 치료 시 환자는 테이블 위에 위치하지만, 방사선 치료를 시행하는 경우 헤드 홀더를 치료 테이블에 걸쳐서 사용하기 때문에 체중 및 여러 가지 요소로 인한 기하학적 불일치로 상, 하, 좌, 우 및 처짐의 현상이 발생할 수 있다. 이러한 환자 Set-Up의 재현성의 불일치를 개선하기 위해 두경부암 전용 헤드 홀더를 자체 고안하여 제작 및 개발하여 유용성을 평가하였다. Alderson Rando Phantom을 이용하여 전산화단층촬영장치(High Advantage, GE, U.S.A)를 통해 이미지를 획득하였고, 광자선 4MV 세기변조 방사선치료(IMRT) 방식을 적용하여 최적화된 치료 계획을 실시하였다. 선형가속기(21EX, Varian, U.S.A)를 이용하여 모의 치료와 동일한 상태에서 환자를 set-up한 후 에 치료기에 장착된 CBCT를 이용하여 각각의 무게(0,15,30Kg)의 차이를 통해 교정 전, 후 X, Y, Z축의 오차를 5회 반복 측정한 결과는 다음과 같다. 0Kg에서 $0.4{\pm}0.8mm$, $0.8{\pm}0.4mm$, 0mm으로 나타났고, 교정 후에는 $0.2{\pm}0.8mm$, $0.4{\pm}0.5mm$, 0으로 나타났다. 15Kg에서 교정 전,후 오차는 $0.2{\pm}0.8mm$, $1.2{\pm}0.4mm$, $2.2{\pm}0.4mm$와 $0.2{\pm}0.4mm$, $0.4{\pm}0.5mm$, $0.4{\pm}0.5mm$로 나타났다. 30Kg에서 교정 전,후 오차는 $0.8{\pm}0.4mm$, $2.4{\pm}0.5mm$, $4.4{\pm}0.8mm$와 $0.6{\pm}0.54mm$, $1{\pm}0mm$, $0.6{\pm}0.5mm$로 나타났다. 각각의 교정 전,후의 통계적으로 분석한 결과 15Kg인 경우 Z축에서 p<0.034, 30Kg인 경우 Y, Z축에서 p<0.038, p<0.041 로 유의한 결과를 나타냈다. 두경부암 전용 방향 조절 장치 헤드 홀더가 환자의 set-up오차를 줄여주는 역할을 해주는 것으로 나타났다. 또한 오차를 줄여줌으로써 환자의 재현성이 향상되어 보다 정밀하고 정확한 방사선 치료를 구현할 수 있을 것으로 사료된다. In case of all patients who receive radiation therapy, a treatment plan is established and all steps of treatment are planned in the same geometrical condition. In case of head and neck cancer patients who undergo simulated treatment through computed tomography (CT), patients are fixed onto a table for planning, but laid on the top of the treatment table in the radiation therapy room. This study excogitated and fabricated an adjustable holder for head and neck cancer patients to fix patient's position and geometrical discrepancies when performing radiation therapy on head and neck cancer patients, and compared the error before and after adjusting the position of patients due to difference in weight to evaluate the correlation between patients' weight and range of error. Computed tomography system(High Advantage, GE, USA) is used for phantom to maintain the supine position to acquire the images of the therapy site for IMRT. IMRT 4MV X-rays was used by applying the LINAC(21EX, Varian, U.S.A). Treatment planning system (Pinnacle, ver. 9.1h, Philips, Madison, USA) was used. The setup accuracy was compared with each measurement was repeated five times for each weight (0, 15, and 30Kg) and CBCT was performed 30 times to find the mean and standard deviation of errors before and after the adjustment of each weight. SPSS ver.19.0(SPSS Inc., Chicago, IL,USA) statistics program was used to perform the Wilcoxon Rank test for significance evaluation and the Spearman analysis was used as the tool to analyze the significance evaluation of the correlation of weight. As a result of measuring the error values from CBCT before and after adjusting the position due to the weight difference, X,Y,Z axis was $0.4{\pm}0.8mm$, $0.8{\pm}0.4mm$, 0 for 0Kg before the adjustment. In 15Kg CBCT before and after adjusting the position due to the weight difference, X,Y,Z axis was $0.2{\pm}0.8mm$, $1.2{\pm}0.4mm$, $2.0{\pm}0.4mm$. After adjusting position was X,Y,Z axis was $0.2{\pm}0.4mm$, $0.4{\pm}0.5mm$, $0.4{\pm}0.5mm$. In 30Kg CBCT before and after adjusting the position due to the weight difference, X,Y,Z axis was $0.8{\pm}0.4mm$, $2.4{\pm}0.5mm$, $4.4{\pm}0.8mm$. After adjusting position was X,Y,Z axis was $0.6{\pm}0.5mm$, $1.0{\pm}0mm$, $0.6{\pm}0.5mm$. When the holder for the head and neck cancer was used to adjust the ab.0ove error value, the error values from CBCT were $0.2{\pm}0.8mm$ for the X axis, $0.40{\pm}0.54mm$ for Y axis, and 0 for Z axis. As a result of statistically analyzing each value before and after the adjustment the value was significant with p<0.034 at the Z axis with 15Kg of weight and with p<0.038 and p<0.041 at the Y and Z axes respectively with 30Kg of weight. There was a significant difference with p<0.008 when the analysis was performed through Kruscal-Wallis in terms of the difference in the adjusted values of the three weight groups. As it could reduce the errors, patients' reproduction could be improved for more precise and accurate radiation therapy. Development of an adjustable device for head and neck cancer patients is significant because it improves the reproduction of existing equipment by reducing the errors in patients' position.

치환기 특성에 따른 아민흡수제와 CO₂의 반응특성 평가

심재구,이정현,정진규,곽노상,Shim, Jae-Goo,Lee, Junghyun,Jung, Jin-Kyu,Kwak, No-Sang 한국전력공사 2020 KEPCO Journal on electric power and energy Vol.6 No.3

The reaction of carbon dioxide with the amine-based absorbents which have various substituents in the molecule was described. In the case of MEA which is a representative primary amine, the absorption reaction was proceeded very fast while the regeneration reaction was took place slowly due to the strong bond strength between the absorbent and carbon dioxide. The more substituents on N atom of the absorbent, the slower the absorption reaction between carbon dioxide and the absorbent, which in turn causes faster the regeneration rate from the reaction intermediate, carbamate.

스마트 학습법이 보건 계열 학생들에게 성취목표지향성 및 학업적 자기 효능감이 미치는 효과

심재구(Jae-Goo Shim),박수진(Soo-Jin Park) 한국방사선학회 2017 한국방사선학회 논문지 Vol.11 No.4

스마트 학습법을 적용한 학생과 적용하지 않은 학생들을 대상으로 자기주도적 학습능력 및 학업적 자기 효능감이 효과적으로 적용되었는지 알아보고 향 후 보건 계열 방사선과 전공과목에 스마트 학습법을 적용한 효과에 대해 논의 및 향 후 발전적인 방향에 대해 제언하고자 한다. 2016년 3월부터 6월까지 한 학기동안 스마트 학습법으로 강의를 받은 학생과 스마트 학습법을 적용하지 않은 학생 두 분류로 나누었고 자료 수집방법은 자가 보고형 질문지 방식으로 진행하였다. 스마트 학습법으로 강의를 받은 교육군이 비교육군에 비해 자기주도 학습능력를 검정한 결과, 5점 만점에 교육군이 3.46점, 비교육군이 2.63점으로 통계적으로 유의한 차이가 있는 것으로 나타났고(t=9.721, p=.000), 성취목표지향성을 검정한 결과, 교육군이 3.12점, 비교육군이 2.92점으로 통계적으로 유의한 차이가 있는 것으로 나타났다(t=4.544, p=.000). 위의 결과로 스마트학습법이 자기주도학습, 학업적 자기효능감 및 학습 만족도에 대해 긍정적인 영향을 보여줬으며, 향후 보건 계열 학과에서도 교수자는 학습자와 쌍방향 커뮤니케이션을 통해 강의의 질적 향상을 위해 학습 변화가 필요하다. The purpose of this was to study and analyze smart learning the self directed learning, self efficacy, learning satisfaction about department of radiology in a college. For this study total students 74 in 2classes were surveyed at the end of semester. Compared to use smartphones one group and not use smartphones one group for study in a class. The research data was analyzed using SPSS also self directed learning ,self learning efficacy, learning satisfaction analyzed t-test, general character was analyzed two group(one : Used smart learning other : not Used smart learning) χ2-test. First, Used smart learning group is more higher than not Used smart learning group in a self learning efficacy, self directed learning, learning satisfaction. Second, during the smart learning classes a students appeared a positive response. Suggest to change a paradigm in a radiology classes so we have to improve a teaching skills this solution recommend is two way communication. In conclusion, smart learning applied for classes of college is meaningful as a new teaching, which can be change gradually learning satisfaction by teaching methods.

Factor Analysis of Decreased Score on Coronary Artery Calcium Score

심재구(Jae Goo Shim),김연민(Yon Min Kim),김진우(Jin Woo Kim) 한국방사선학회 2016 한국방사선학회 논문지 Vol.10 No.4

이 연구는 관상동맥 CT 석회화점수 검사를 2회 이상 받은 자 중에서, 이전에 비하여 점수가 낮아진 원인을 후향적으로 분석하였다. 건강검자 환자 100명(남자 85명 60.6±6.9세, 여자 15명 67.2±7.3세)을 대상으로 하였다. 석회화점수 감소가 발생한 경우를 Agatston의 분류 방법에 따라 minimal (1-10), mild(11-100), moderate(101-400), severe (400< ) 4개 그룹으로 분류하였다. Mild 그룹에서 49명으로 가장 많았으며, minimal 그룹에서 감소율 변동이 가장 크게 나타났다. 석회화점수 감소 요인은 Scan location 불일치 51%, Motion artifact 26%, 장비변동 14%, 작업자의 실수 5%, 입력 miss 2%, Image loss 1%, 부정맥 1% 로 나타났다. Scan location의 불일치는 scan된 석회화의 slice 위치에 따른 부분체적 효과로 생각되며, 관상동맥 석회화 점수가 작은 100 이하 그룹에서는 높은 변화폭(19.7%)이 나타났고 100 이상의 그룹에서는 낮은 변화폭(2.2%)을 보여 석회화 점수에 따라 허용될 수 있는 변화폭이 달라진다는 것을 알 수 있었다. Motion artifact 요인은 26%로 나타났으며, 이는 높은 심박동에 의한 것으로 심박동이 높거나 검사 전 폐기능, 운동부하 등 심박동에 영향을 미치는 선행검사와 밀접한 관련이 있었다. The purpose of our study was to retrospectively evaluate the cause of a decreased calcium score of follow-up studies on coronary artery calcium scores (CACs) computed tomography (CT). The subjects were healthy 100 people(85 males 60.6±6.9 years, 15 females 67.2±7.3 years). The subjects decreased CACs were divided into 4 subgroups depending on Agatston classification, minimal (1-10), mild (11-100), moderate (101-400), severe (400<). As a result of decreased CACs were scan location disagreement 51%, motion artifact 26%, equipment changes 14%, operator mistakes 5%, input miss 2%, image loss 1%, arrhythmia 1%. In the mild group, the most common decreased CACs were 49 people. In the minimal group, the most significant variation reduction has occurred to 6 people. Scan location disagreement was considered a partial volume effects due to the scan starting position. It showed less than 100 CACs a high variation (19.7%) in more than 100 CACs, a lower variation (2.2%), these could be seen that the variation range is different that can be tolerated according to the calcification score. Motion artifact factor was found in 26%, which is so closely related to the preceding tests that affect the higher heart rate like this pulmonary function test, exercise stress test.

방사선과 학생을 위한 가상현실 교육콘텐츠 개발 및 적용을 통한 학습효과 분석

심재구(Shim Jae-Goo),권순무(Kwon Soon-Moo) 대한방사선과학회(구 대한방사선기술학회) 2020 방사선기술과학 Vol.43 No.6

This study developed radiation therapy contents based on virtual reality technology and applied them to radiation students. A survey was conducted to analyze the relationship between learning effects and learning satisfaction to students who used virtual reality education videos to analyze their learning performance. 71 students radiology department were classified into two groups one that experienced virtual reality and the other that did not experienced virtual reality. We surveyed between the two groups analyzed self-directed learning, self-learning efficacy and learning satisfaction. As a result, the comparison between the two groups showed no difference between self-directed learning and self-learning efficacy. But the learning satisfaction was significant from 2.64±0.83 to 3.20±0.88 in the problem solving process for groups applying virtual reality contents. Therefore, learning satisfaction has improved experienced group virtual reality content and the materials for virtual reality education can be applied more efficiently in non-face-to-face lectures.

수용액상 니트로스아민의 UV 광분해에서 pH 영향

심재구 ( Jae-goo Shim ),아프잘아킬 ( Afzal Aqeel ),최보미 ( Bo-mi Choi ),이정현 ( Jung-hyun Lee ),곽노상 ( No-sang Kwak ),임호진 ( Ho-jin Lim ) 한국물환경학회(구 한국수질보전학회) 2016 한국물환경학회지 Vol.32 No.4

N-nitrosamines are a class of carcinogenic chemicals that can pose significant hazards to the human life. Ultraviolet (UV) light irradiation is considered as one of the effective methods to reduce N-nitrosamines in the aqueous phase. This study aimed to investigate the pH influence on UV photodegradation of N-nitrosamines (i.e., N-nitrosodibutylamine (NDBA) and N-nitrosopyrrolidine (NPYR)) closely related to water treatment. Photodegradation rate constants of NDBA and NPYR remained between 3.26×10-2 L/W-min to 5.08×10-3 L/W-min and 1.14×10-2 L/W-min to 2.80×10-3 L/W-min at pH2-10, respectively. This study also focused on the formation of oxidized products (i.e., primarily NO2- and NO3-). Under slightly acidic and eutral conditions, NO2- formation was more prevalent than NO3- formation, while under strong acidic conditions, NO3- was more prevalent. There was no significant change in total organic carbon (TOC) and total nitrogen (TN), suggesting negligible loss of N-nitrosamines and degradation products from the system. NDBA was easily photodegraded than NPYR. This study also demonstrated that a lower pH is a favorable condition for photolytic degradation of N-nitrosamines in water.

고효율 습식 아민 CO2 흡수제(KoSol-4)를 적용한 Test bed 성능시험

심재구 ( Jae Goo Shim ),이지현 ( Ji Hyun Lee ),곽노상 ( No Sang Kwak ),이인영 ( In Young Lee ),장경룡 ( Kyung Ryoung Jang ),장세규 ( Se Gyu Jang ),이경자 ( Kyung Ja Lee ),한광수 ( Gwang Su Han ),오동훈 ( Dong Hun Oh ) 한국화학공학회 2013 Korean Chemical Engineering Research(HWAHAK KONGHA Vol.51 No.2

Test bed studies with highly efficient amine CO2 solvent (KoSol-4) developed by KEPCO research institute were performed. For the first time in Korea, evaluation of post-combustion CO2 capture technology to capture 2 ton CO2/day from a slipstream of the flue gas from a coal-fired power station was performed. Also the analysis of solvent regeneration energy was conducted to suggest the reliable performance data of the KoSol-4 solvent. For this purpose, we have tested 5 campaigns changing the operating conditions of the solvent flow rate and the stripper pressure. The overall results of these campaigns showed that the CO2 removal rate met the technical guideline (CO2 removal rate: 90%) suggested by IEA-GHG and that the regeneration energy of the KoSol-4 showed about 3.0~3.2 GJ/tCO2 which was, compared to that of the commercial solvent MEA (Monoethanolamine), about 25% reduction of regeneration energy. Based on these results, we could confirm the good performance of the KoSol-4 solvent and the CO2 capture process developed by KEPCO research institute. And also it was expected that the cost of CO2 avoided could be reduced drastically if the KoSol-4 is applied to the commercial scale CO2 capture plant.

방사선종양학과 방사선사의 직무 만족에 관한 조사 연구

심재구(Jae-Goo Shim),정홍량(Hong-Ryang Jung),유인규(In-Kyu You) 한국콘텐츠학회 2012 한국콘텐츠학회논문지 Vol.12 No.8

본 연구는 서울, 경기 지역의 의료 기관에 종사하는 방사선 종양학과 방사선사 211명을 대상으로 직무 스트레스가 조직 효과성에 미치는 영향의 요인별 신뢰도를 분석하였으며, 조직문화와 셀프 리더쉽의 각각의 유형을 분류하기 위해 요인분석을 시행한 결과는 다음과 같다. 직무몰입과 조직 만족도는 성별, 연령에 차이는 없었으나 근무 년 수가 1년 미만과 15년 이상인 경우 유의한 차이를 보였고, 직책이 높을수록 조직 몰입도와 조직 만족도가 높게 나타났다. 각 파트별 근무에 따른 조직 몰입 및 근무 만족도에 대해서는 유의한 차이가 나타나지 않았다. 방사선 종양학과의 직무 특수성간 상관관계를 분석한 결과 직무만족(r=0.601, p<0.001), 조직몰입(r=0.522, p<0.001), 스트레스(r=0.605, p<0.001), 조직문화의 위계지향 (r=-0.182, p=0.008), 조직문화의 혁신지향 (r=0.212, p<0.002), 조직문화의 관계지향 (r=0.453, p<0.001), 셀프리더십의 자부심 (r=0.387, p<0.001), 셀프리더십의 리허설과 자기관찰(r=0.242, p<0.001), 셀프리더십의 자기목표설정(r=0.249, p<0.001), 셀프리더십의 자기보상 (r=0.341, p<0.001) 항목들은 모두 유의한 상관 관계를 보이고 있다. 본 연구의 결과를 통해 향 후 방사선 종양학과 방사선사의 직무 만족도 조사를 통해 효율적인 인력 및 조직 관리 방안을 마련하는데 도움이 될 것으로 사료된다. This study Seoul, Kyonggi area hospital and data were collected from 211 people in radiation therapy technologist. The collected data were analyzed by using SPSS 17 version, For verification of the differences among groups, coefficient of Pearson was executed. It was composed of social demogrphic characteristics, Job stress and the impact the organization effectiveness and reliability analysis of factors. Organization culture and self leadership of each of the types to classify the results of conducted analysis factors are as follows: And the difference in the gender, age, and satisfaction with the Organization. Organization commitment and working in accordance with each part working experience is different. Radiation therapy duties analysis results of correlation between the uniqueness. Job satisfaction(p<0.001), organization commitment(p<0.001), stress(p<0.001), organization culture, gastric-oriented(p=0.008), organization culture and innovation-oriented(p<0.002), organization culture, relationship - oriented (p<0.001). The research shows that job satisfaction of radiation therapy technologist determined the work environment. Therefore more improvements must be made for radiation therapy technologist to be more in their job satisfaction.

국내 포집기술 확보 현황 및 대용량 실증계획

심재구(Jae Goo Shim),곽노상(No-Sang Kwak),이지현(Ji Hyun Lee),이인영(In Young Lee),이동욱(Dong Woog Lee),장경룡(Kyung Ryong Jang) 대한지질학회 2015 대한지질학회 학술대회 Vol.2015 No.10

플라즈마 탈황·탈질 동시처리 공정에서 생성입자의 집진특성

심재구(Jae Goo Shim),천성남(Sung Nam Chun),박태성(Tae Sung Park),장경룡(Kyung Ryong Jang),김우영(Woo Young Kim),홍원석(Won Suk Hong),김용진(Yong Jin Kim),강용(Yong Kang) 大韓環境工學會 2002 대한환경공학회지 Vol.24 No.2